Yuuka vs 20F Golden Mirror (Labyrinth of Touhou 2 Steam)
This boss was harder than I remembered, which is weird because I figured out that Yuuka is *really* good for this fight on my first playthrough. TBH, I'm convinced that the Golden Treasure remixes on 20F were made purposely easy to defeat with Yuuka and Flandre. Anyway, this strategy isn't consistent as it looks. There were two sources of RNG here:
-Inflicting SIL on the boss
-Trying to sneak Yuuka so she could hit the Mirror
On inflicting SIL: Reisen had really good RNG in this run. Normally, the only way I can consistently inflict SIL was at the start (with Reisen and Mystia in front, with Mystia using Sword of Singing Delusion). If it was just Reisen trying to inflict SIL, the chances of it actually proc'ing weren't as good.
On sneaking in Yuuka: I think this is self-explanatory. Even if you don't sub her as a Gambler, you can't really use Yuuka as a stay-in attacker since her FIR resistance is abysmal (and the boss has a shiny new FIR attack in the form of Flowing Hellfire). You'll always need to switch her in and out and while the Mirror has a bunch of high delay moves, it does have a move with only 5500 delay and sometimes it just uses it 5 times in a row.
For added RNG, you can upgrade Yuuka's Exta Attack skill. I personally didn't do that because I really dislike Extra Attack. I actually like Yuuka's Awakened version of the skill (where if you Concentrate, you get a guaranteed double attack) but not the base version.
Music is dBu's arrange of Sleeping Terror
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